From the list of nonsensical error messages:
createdb: unrecognized option '--help'
Try "createdb --help" for more information.
createuser: unrecognized option '--help'
Try "createuser --help" for more information.
Explanation:
If anything is ahead of --help, "--help" is then an unrecognized
option.
But the error message is still nonsensical, absurd and in the end, not
very helpful.
//D.S.